Fatigue, Tremors In Hands After Exertion, Insomnia, Night Sweats, Headache, Ears Ringing

my husband is experiencing a wide range of symptoms that have been coming and goin over the last 2 yrs. they are: extreme, abnormal fatigue , tremors in hands after exertion, insomnia , night sweats , headaches, ringing in ears, and most recently hives . He has a swollen lymph node in his neck that will go down some with antibiotics but then comes right back....although the size varies from week to week....